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from threading import Thread

def func():
    for i in range(1000):
        print('func', i)


if __name__ == '__main__':
    t = Thread(target=func)	# 创建线程并给线程安排任务
    t.start()	# 多线程状态为可以开始工作状态，具体执行时间由CPU决定
    for i in range(1000):
        print('main', i)

运行结果:

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funcmain 0 0
func
main 1
func 2
func 3
func 4
 1
main func 5
func 6
func2
 7
......
funcmain  998992

funcmain  999993

main 994
main 995
main 996
main 997
main 998
main 999